Well, hopeful - she kind of asked for a letter or e-mail. Otherwise, I wouldn't dare write one. Heck, I am feeling edgy enough writing it upon request - I don't think I could muster the nerve to do it without her asking first.
In the beginning, I wrote 2-3 letters to her asking her to stay, telling her I loved her...no more of that. And that really isn't the tone of this letter.